초록 ▼

In a focus detection system for detecting focus condition of an objective lens, there is disposed a pair of photo sensor arrays each having a plurality of photo cells lined up in one diection to receive a first image and second image passed through respectively a lens system and the photo sensor arr

In a focus detection system for detecting focus condition of an objective lens, there is disposed a pair of photo sensor arrays each having a plurality of photo cells lined up in one diection to receive a first image and second image passed through respectively a lens system and the photo sensor arrays produce first original signal groups and second original signal groups each signal groups corresponding to light intensity of the images projected thereto. A processing device processes the original signal groups in such a manner that the first original signal groups are respectively divided into a plurality of blocks, and one of the blocks of the first original signal groups is selected and it is detected that in what group in the selected block best coincidence occurs.

대표청구항 ▼

A focus detection system for detecting the focus condition of an objective lens, comprising: optical means for forming displaced first and second images of an object so that the distance between the first and second images varies with the focus condition of the object image formed by the objective l

A focus detection system for detecting the focus condition of an objective lens, comprising: optical means for forming displaced first and second images of an object so that the distance between the first and second images varies with the focus condition of the object image formed by the objective lens; image signal generating means for generating first and second image signals corresponding to the intensity distributions of the first and second object images; signal dividing means for dividing the first image signal into a plurality of block image signals, one of the block image signals being larger than the other block image signals; selecting means for selecting one of the block image signals; discriminating means for discriminating whether the reliability of focus detection using the selected block image signal is over a predetermined level or not; and defocus amount calculating means for calculating the amount of defocus of the object image formed by the objective lens relating to the selected block image signal, and for calculating the amount of defocus relating to the block image signals other than the selected block image signal.